Leather staking and stretching machine



'(No Model.) 2 Sheet's-Shet 1.

G. W. BAKER.

LEATHER STAKING AND STRETOHING MACHINE. No. 451.796. Patented May 5. 1891.

L l/VVE/VTUR Gall/3am g, ATTORNEY,

' m WW w UNITED STATES PATENT OFFICE.

GEORGE TV. BAKER, OF WILMINGTON, DELAWARE.

LEATHER STAKING AND STRETCHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 451,796, dated May 5, 1891.

Application filed December 11, 1890. Serial No. 374,273. (No model;)

To ail whom it may concern.-

Be it known that I, GEORGE W. BAKER, a citizen of the United States, and a resident of W'ilmingtomin the county of Newcastle and State of Delaware, have invented certain new and useful Improvements in Leather Staking and Stretching Machines; and I do declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

Figure l of the drawings is a side elevation. Fig. 2 is a top plan view. Fig. 3 is a vertical longitudinal section. Fig. at is a sectional detail, and Figs. 5 and 6 are detail views.

The invention relates to machines especially adapted for stretching and staking very soft or pliable leather; and it consists in the novel construction and combination of parts, all as hereinafter set forth.

In the embodiment of my invention I provide a supporting-frame A and the rotary Wheel or disk B, having its shaft I) mounted in suitable bearings. This wheel or disk has a broad circumferential bearing-surface B, on which are secured at regular intervals the staking knives a, five being usually employed. Each knife is secured to a bearing plate or holder a, which also carries the inclined deflector-plate a.

At the sides of the upper portion of the wheel or disk are placed the arc-shaped wings or plates V V, which are secured to covered bearings 19' of the frame and serve, with the broadhpper fan portion of the wheel or disk to which they are adjunct, to'form the beds for the skins or leather.

0 0 represent arms journaled on the shaft 1) and supporting a transom rod-shaft c, to which is attached the staking and stretching tool D in an adjustable manner. These arms 0 C are connected to pitmen a a, which are respect'ivelyconnected to crank-arms of the driving-shaftE,which is j ournaled in bearings of the frame A at a sufficient horizontal distance from the shaft 1) of the wheel-disk B. By this arrangement an intermittent reciprocation of the staking-tool is provided for, and the wheel or disk B is designed to have a corresponding intermittent rotation in one direction. To this end the shaft b is provided wit-h a ratchet-collar e, which is secured to said shaft, while the arm 0' has a pawl 6, adapted to engage said ratchet-collar. The number of teeth upon the ratchet of the collar determines the number of intermittent movements of the whe l or disk B to a complete revolution, as well as the number of reciprocatory movements of the staking-tool, it being designed that the staking-tool shall move forward with the disk or wheel at each of the .movements of the latter and move backward to its starting-point during the stoppages of said disk or wheel, or while it is stationary between its successive movements. This construction is especially designed for very soft or pliable skins or leather which would be difficult, if not impossible, to hook on a reciprocating bed or table.

When the staking-tool moves backward to its first position, it is raised clear of the leather in the following manner: The rod-shaft c of the tool has a crank-arm c", which is in turn connectedby a link 0' to an arm f, which is pivoted to the arm 0'. At about its middle portion the arm f has a stud or roller g, engaging the arc-slot'v of the cam-lever F, which is provided with a journal-pin g at its lower end, said pin having a vertical bearing-slide G, which is connected to the frame A by suitable guides g" and g. A suitable retracting-spring g connects the slide G to the frame, and the slotted cam-lever F is connected by the pitman G to an adjustable stud h of the crank wheel or arm of the drivingshaft E. j

H is a treadle pivoted to the frame A and adapted to engage the bearing-slide G, in order that thelatter may be moved upward to actuate the cam-lever F, the arm f, the link 0, the crank-arm c, and the rod-shaft c,

whereby the tool D is brought down upon the knife plate or holder between the knife and z the deflector flange or plate a. ure is in this way governed by the operator through the treadle. Light pressure, which The press- IOO fore the commencement of its forward movement and to raise said tool from the knifeholder at the end of said movement and just before the tool commences to move backward to its first position near the gripping or clampin g device.

I represents a transom rod or shaft supported in bearings I of the frame and carrying the adjustable clamp J, which consists of the grip-block 7t and its arm and serves when pressed forward against the transombearing strip K of the frame to hold the end of the skin or piece of leather during the staking and stretching operation. ping is automatically effected When the tool D is returned to its first position near the strip It by means of a cam e on the driving-shaft E and a pitman e", detachably engaging a crank-arm of the rod I. A spring extending from an attachment on the frame A is connected to said pitman to move it in the reverse direction when the cam in its revolution has ceased acting in order that the pitman 6 may be moved backward to open the clamp or grip to release the stem. In order that the movement of this pitman may not be controlled by the driving shaft, the end of the pitman is slotted, as at e', for the passage of said shaft.

J represents a reciprocating bar extending longitudinally alongside the disk B from the driving-shaft E, and supported upon said shaft and the shaft of said disk B by means of the slotted bearings Z Z. This baris moved forward by means of the cam s on the driving-shaft, which engages a shoulder m of said bar and rearward by means of a spring .9, connecting said bar to the frame. The bar is notched on the side adjacent to disk B, as indicated at n, and is provided with a stopplate or projection 19 at the rear end of this notch, as indicated. This disk B has a number of pins t, in number corresponding to the number of knives carried by said disk and located at equal distances apart in such position that said disk will be positively stopped by the engagement of one of these pins with the stop-plate p of the bar J when it reaches the limit of the forward movement given to it by the engagement of the pawl and ratchet hereinbefore described. After the stoppage, however, of the bar J, and as the staking-tool moves backward to its first position the arm releases the bar J and its actuating-spring removes it to the rear A, carrying its stopplate out of engagement with the pin of the disk 13 and allowing said disk to take on the movement given to its shaft by the action of the ratchet and pawl. In this manner the disk is prevented from over rotation and the movement of the staking-tool is made to correspond accurately with that of the disk, so as to'operate in proper relation to its knives.

The operation of the machine is as follows: The skin is manipulated by the operator standingattheclamp. Theskinbeingspread This gripupon the disk and the arched wings is held by the clamp at its edge or a portion of its edge, and is stretched and worked by the action of the knives and tools as the disk rotates, the action being always in one directionthat of the rotation of the disk or from the operator. As the clamp moves intermittently, the skin can be readily adjusted by the operator in different positions, according to its requirement.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a leather-stretching machine, the combination, with an intermittently-rotating disk carrying upon its broad periphery the series of knives and deflectors, of the clamp and reciprocating staking-tool, together with mechanism for actuating the same, substantially as specified.

2. In a leather stretching machine, the broad rotating disk having upon its periphery the knives and deflectors, the adjacent arched wings or tables, and mechanism for rotating said disk in an intermittent manner between said arched wings or table, substantially as specified.

3. In aleather-stretching machine, the combination,'with an intermittently-rotating disk, its knives and deflectors, and the lateral arched wings or tables adjacent to the upper part of said disk, of the reciprocating staking-tool and the actuating mechanism thereto, substantially as specified.

4. In a leather-stretching machine, the combination, with an intermittently-rotatin g disk, its knives and deflectors, and the lateral arched wings or tables adjacent to the upper part of said disk, of the adjustable reciproeating staking-tool and the stop-movement for said disk, substantially as specified.

5. In a leather-stretching machine, the combination, with the adjustable reciprocating tool and its carrying-rod, of the pawl-carr ing arms, the driving-shaft and pitmen, the treadles, slide-bearings, cam-lever, and connections to said carrying-rod, substantially as specified.

6. In a leather-stretching machine, the combination, with the disk-shaft and the toolshaft, of the arms 0 O and pitmen a' a, the drive-shaft, the ratchet-collar e, and the pawl e, substantially as specified.

7. In a leather-stretching machine, the 001m bination, with the driving-shaft, the diskshaft, and the tool-shaft, of the vibrating arms 0 O and the arc-slot lever, the pitmen a a and G, the crank-arm of the tool-shaft, its link connection, and the pivoted armf, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses. V

GEORGE \V. BAKER.

Witnesses:

PHILIP O. MASI, CHAS. L. TAYLOR.

IIO 

